草酸改性膨润土对亚甲基蓝吸附性能的研究
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摘要
采用有机酸草酸改性天然膨润土(RB),制备了草酸膨润土(OAB),同时考察了膨润土与草酸质量之比、OAB投加量、溶液初始pH值、亚甲基蓝(MB)初始浓度、吸附时间对OAB去除MB的影响。结果显示,在膨润土与草酸质量比为1:1,OAB投加量为2g/L,溶液初始pH值为6%8,MB初始浓度为200mg/L,吸附2h能达到最佳去处效果,饱和吸附量为96. 9mg/g。进一步研究了OAB吸附MB的吸附动力学和吸附等温模型,结果表明,拟二级动力学和Langmuir模型能更好地描述OAB吸附MB。此外,还采用SEM观察了OAB吸附亚甲基蓝前后的表面微观形貌特征,采用FTIR对吸附前后的OAB进行表征,均表现出了关联性。
The modified bentonite( OAB) was prepared using natural bentonite(RB) modified with oxalic acid,and at the same time the effects of the ratio of the mass of bentonite and oxalic acid,OAB dosage,initial pH value,methylene blue( MB) initial concentration,adsorption time on MB adsorption have been studied. The results show that the better MB adsorption effect can be obtained when the ratio of the mass of bentonite and oxalic acid is 1: 1,OAB dosage is 2g/L,initial pH value is 6 %8,initial concentration is 200 mg/L,adsorption time is 2 h and the saturated adsorption capacity is 96. 9 mg/g.The dynamics and isotherm model of MB on OAB have been further studied. The results prove that the adsorption dynamic model of MB on OAB fits with psendo-second-order dynamic model,and the adsorption fits with Langmuir isothermal adsorption models. In addition,SEM was used to observe the surface micro-morphology of adsorbed methylene blue before and after OAB,and OAB before and after adsorption was characterized by FTIR. In addition,SEM was used to observe the surface micro-morphology of adsorbed methylene blue before and after OAB,and FTIR was used to characterize the OAB before and after adsorption.
The modified bentonite( OAB) was prepared using natural bentonite(RB) modified with oxalic acid,and at the same time the effects of the ratio of the mass of bentonite and oxalic acid,OAB dosage,initial pH value,methylene blue( MB) initial concentration,adsorption time on MB adsorption have been studied. The results show that the better MB adsorption effect can be obtained when the ratio of the mass of bentonite and oxalic acid is 1: 1,OAB dosage is 2g/L,initial pH value is 6 %8,initial concentration is 200 mg/L,adsorption time is 2 h and the saturated adsorption capacity is 96. 9 mg/g.The dynamics and isotherm model of MB on OAB have been further studied. The results prove that the adsorption dynamic model of MB on OAB fits with psendo-second-order dynamic model,and the adsorption fits with Langmuir isothermal adsorption models. In addition,SEM was used to observe the surface micro-morphology of adsorbed methylene blue before and after OAB,and OAB before and after adsorption was characterized by FTIR. In addition,SEM was used to observe the surface micro-morphology of adsorbed methylene blue before and after OAB,and FTIR was used to characterize the OAB before and after adsorption.
引文
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[2]郭怡秦,郭亚丹,王学刚,等.环境治理技术与光催化组合工艺的研究及应用[J].工业水处理,2017,37(12):5-10.
[3]Cheung W H,Szeto Y S,Mckay G.Enhancing the adsorption capacities of acid dyes by chitosan nano particles[J].Bioresource Technology,2009,100(3):1143-1152.
[4]Senthilkumaar S,Varadarajan P R,Porkodi K,et al.Adsorption of methylene blue onto jute fiber carbon:kinetics and equilibrium studies[J].Journal of Colloid&Interface Science,2005,284(1):78-82.
[5]Wang C T,Hu J L,Chou W L,et al.Removal of color from real dyeing wastewater by Electro-Fenton technology using a three-dimensional graphite cathode[J].Journal of Hazardous Materials,2008,152(2):601-606.
[6]梁喜珍,周跃明,王梅.超声波芬顿法协同降解亚甲基蓝的研究[J].东华理工大学学报(自然科学版),2010,33(2):183-186.
[7]Boumaza S,Kaouah F,Hamane D,et al.Visible light assisted decolorization of azo dyes:Direct Red 16 and Direct Blue71 in aqueous solution on the p-Cu Fe O2/n-Zn O system[J].Journal of Molecular Catalysis AChemical,2014,393(18):156-165.
[8]Türgay O,Ers9z G,Atalay S,et al.The treatment of azo dyes found in textile industry wastewater by anaerobic biological method and chemical oxidation[J].Separation&Purification Technology,2011,79(1):26-33.
[9]Esteves B M,Rodrigues C S,Boaventura R A,et al.Coupling of acrylic dyeing wastewater treatment by heterogeneous Fenton oxidation in a continuous stirred tank reactor with biological degradation in a sequential batch reactor[J].Journal of Environmental Management,2016,166:193-198.
[10]高永,孔峰,程洁红,等.Ti O2光催化-微滤膜分离深度净化亚甲基蓝印染废水[J].环境工程学报,2012,6(10):3585-3590.
[11]马文清,赫文芳,王雲生,等.磁性埃洛石复合材料的制备及其对亚甲基蓝吸附性能研究[J].硅酸盐通报,2017,36(1):242-248.
[12]刘志雄,孙琳,胡洁,等.Cu Fe O2的制备、表征及对亚甲基蓝的吸附性能[J].精细化工,2017,34(4):444-450.
[13]张晓伟,岳钦艳,岳东亭,等.Fe0-C-Clay陶粒用于亚甲基蓝模拟废水处理的研究[J].环境工程,2013,31(4):13-16.
[14]张骞,胡将军,周王敕.炭载Mn-Co-Ce复合氧化物粒子电极处理亚甲基蓝模拟废水[J].环境工程,2017,35(3):28-33.
[15]Wang S,Zhu Z H.Characterisation and environmental application of an Australian natural zeolite for basic dye removal from aqueous solution[J].Journal of Hazardous Materials,2006,136(3):946-952.
[16]王元凤.谷壳和梧桐树叶对水体中亚甲基蓝和刚果红的吸附研究[D].郑州:郑州大学,2007.
[17]张志诚,赵黄艳,宋银华,等.乙酸膨润土对亚甲基蓝的吸附研究[J].非金属矿,2013,36(6):70-73.
[18]范琼,张学亮,张弦,等.橘子皮对水中亚甲蓝的吸附性能研究[J].中国生物工程杂志,2007,27(5):85-89.
[19]Chinoune K,Bentaleb K,Bouberka Z,et al.Adsorption of reactive dyes from aqueous solution by dirty bentonite[J].Applied Clay Science,2016,123:64-75.
[20]Ho Y S,Mckay G.Pseudo-second order model for sorption processes[J].Process Biochemistry,1999,34(5):451-465.